require more input parameters. They thus account for additional properties of the atmosphere, weather, the substance released, and/or the terrain (Table 19.3). Examples of such properties include changes in wind direction and/or other meteorological parameters over time and space, non-flat terrain, air flow around buildings, settling of particles from the atmosphere, washout of the substance from the air by precipitation, temperature inversions, and decay or deactivation of the substance (e.g., some chemicals react with air and become inert quickly relative to the time it takes to disperse to locations of interest).4

table 19.3 Characteristics of Dispersion Models

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